Question

Having a problem here with creating a child window with c++ and win32 api.
If i check the getLastError function its returning “87” but i dont know what that means.
For what i know my code does not contain errors, can someone take a look at my code and help me figure out whats wrong with it.

(This is in the WinProc WM_CREATE section.)

        HWND hChildWindow   =   CreateWindowEx(WS_EX_CLIENTEDGE,0,NULL,WS_OVERLAPPEDWINDOW|WS_VISIBLE,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,hwnd,0,GetModuleHandle(0),NULL);
    if(!hChildWindow)
    {
         char text[256];
             int errormsg = (int)GetLastError();
             sprintf(text,"Error# %i",errormsg);
             MessageBox(0,text,"Error",MB_OK|MB_ICONEXCLAMATION);   
         return false;
    }

Answer 1

87 = Invalid Parameter – be aware that you can use FormatMessage to get a string message from an error code.